Schedule of Consolidated VIEs, Carrying Amounts of Assets and Liabilities - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Cash and cash equivalents (variable interest entities restricted - 2020: $41; 2019: $37)	$ 3,724	$ 2,367
Other current assets	606	658
Net property (variable interest entities restricted - 2020: $284; 2019: $330)	20,618	20,996
Deferred charges and other assets	1,137	818
Total Assets	59,276	60,524
Accrued and other current liabilities	2,731	2,762
Long-term debt	16,288	15,975
Other noncurrent obligations	7,404	6,547
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents (variable interest entities restricted - 2020: $41; 2019: $37)	41	37
Other current assets	56	51
Net property (variable interest entities restricted - 2020: $284; 2019: $330)	284	330
Deferred charges and other assets	17	18
Total Assets	398	436
Accrued and other current liabilities	122	141
Long-term debt	20	34
Other noncurrent obligations	19	21
Total Liabilities	$ 161	$ 196